Update WebRTC code version (2025-07-05T04:05:42).

Bug: None
Change-Id: Ibbf694be8002508e24a4440a9d00a52478a30533
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/399156
Bot-Commit: webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com <webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com>
Commit-Queue: webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com <webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#45100}

call/version.cc

diff --git a/call/version.cc b/call/version.cc
index 84b8226..1a6f1c6 100644
--- a/call/version.cc
+++ b/call/version.cc
@@ -13,7 +13,7 @@
 namespace webrtc {
 
 // The timestamp is always in UTC.
-const char* const kSourceTimestamp = "WebRTC source stamp 2025-07-04T04:02:17";
+const char* const kSourceTimestamp = "WebRTC source stamp 2025-07-05T04:05:42";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even